Effects of group II elements on the cold stretch formability of Mg–Zn alloys

Yuasa, Motohiro; Miyazawa, Naoki; Hayashi, Makoto; Mabuchi, Mamoru; Chino, Yasumasa

doi:10.1016/j.actamat.2014.10.005

Cited by 120 publications

(17 citation statements)

References 55 publications

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“…Despite the differences in r -values and strengths depending on tensile loading directions, ZX11 alloy shows the Index Erichsen (IE) value of 8.8 mm, which is much larger than that of AZ31 alloy at the same yield strength level 5 . It is also interesting to note that ZX11 alloy shows high IE value, despite the presence of rather coarse (~1 μm) precipitates in the microstructure 11 , suggesting that the precipitates have a minor effect on the stretch formability, similar to the results of Yuasa et al 30 . The thickness strain at the top of the dome after stretch forming was measured at dome heights of 4.2 mm and 8.8 mm (after failure).…”

Section: Resultssupporting

confidence: 81%

Twinning-mediated formability in Mg alloys

Suh

Kim

Hwang

et al. 2016

Sci Rep

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Mg alloys are promising candidates for automotive applications due to their low density and high specific strength. However, their widespread applications have not been realized mainly because of poor formability at room temperature, arising from limited number of active deformation systems and strong basal texture. It has been recently shown that Mg-Zn-Ca alloys have excellent stretch formability, which has been ascribed to their weak basal texture. However, the distribution of basal poles is orthotropic, which might result in anisotropy during deformation and have adverse effect on formability. Here, we show that tension twinning is mainly responsible for enhanced formability of Mg-Zn-Ca alloys. We found that tension twinning is quite active during both uniaxial deformation and biaxial deformation of Mg-Zn-Ca alloy even under the stress conditions unfavourable for the formation of tensile twins. Our results provide new insights into the development of Mg alloys having high formability.

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Section: Resultssupporting

confidence: 81%

Twinning-mediated formability in Mg alloys

Suh

Kim

Hwang

et al. 2016

Sci Rep

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“…Generally, dislocations generated during the early stage of plastic deformation bend the crystal, leading to the so-called in-crystal misorientation, and through the characteristics of this misorientation axis, the type of dislocation can be determined. For example, basal dislocations induce the crystal bending around 101 0 , whereas an axis parallel to 0001 is obtained in the case of prismatic dislocation-plasticized crystals [20,21]. The ICMA measurements carried out on the stretched alloys samples are shown in Figure 4.…”

Section: Resultsmentioning

confidence: 99%

Ca-induced Plasticity in Magnesium Alloy: EBSD Measurements and VPSC Calculations

2020

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In the present work, Ca-induced plasticity of AZ31 magnesium alloy was studied using electron backscattered diffraction (EBSD) measurements supported by viscoplastic self-consistent (VPSC) calculations. For this purpose, alloy samples were stretched to various strains (5%, 10%, and 15%) at room temperature and a strain rate of 10−3 s−1. The EBSD measurements showed a higher activity of non-basal slip system (prismatic slip) as compared to that of tension twins. The VPSC confirmed the EBSD results, where it was found that the critical resolved shear stress of the various slip systems and their corresponding activities changed during the stretching of the alloy samples.

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“…Ca addition in Mg–Zn alloys is able to refine dynamically recrystallized (DRXed) grains, promote dynamic precipitates, as well as weaken texture after deformation, which is considered to be one of the promising additives for high‐strength low‐cost Mg alloys . Minor addition of rare earth (RE) elements weakens the basal texture or gives rise to a so called RE texture component .…”

Section: Introductionmentioning

confidence: 99%

Strength and Ductility Balance on an Extruded Mg–Zn–Ca–La Alloy

Zheng

Qiao

et al. 2017

Adv Eng Mater

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Mg-6Zn-0.7Ca-0.2La (wt%) alloy is cast and extruded in the present study. The microstructure of the as-extruded Mg-6Zn-0.7Ca-0.2La (wt%) alloy is investigated via scanning electron microscopy (SEM), transmission electron microscope (TEM) and electron backscattering diffraction (EBSD). Results show that the as-extruded Mg-6Zn-0.7Ca-0.2La (wt%) alloy exhibited a balanced strength and ductility with the yield strength of 261 MPa and elongation-to-fracture of 20.7%. The superior strength is mainly attributed to grain refinement and precipitates, whereas the plasticity is ascribed to fine homogenous microstructure and weaker texture. The fine microstructure is obtained in the as-extruded Mg-6Zn-0.7Ca-0.2La (wt%) alloy, mainly attributing to the dynamic recrystallization and pinning effects from precipitates.

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Effects of group II elements on the cold stretch formability of Mg–Zn alloys

Cited by 120 publications

References 55 publications

Twinning-mediated formability in Mg alloys

Twinning-mediated formability in Mg alloys

Ca-induced Plasticity in Magnesium Alloy: EBSD Measurements and VPSC Calculations

Strength and Ductility Balance on an Extruded Mg–Zn–Ca–La Alloy

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